Hi there , i have a 98 mitsubishi challenger 98 petrol, Havin probs with missing and trans surging. it missis on and off for a couple off days then it be'll fine the next two. When you start it , sometimes the revs go to about 4000 rev until you tap the acc or it will rev all over the place till ya tap the accel, Can you help me ? have changed the sparkplugs thinkin it was that.

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Sounds Like you may have a trans issue. If it's revving while shifting (called 'flaring") and/or downshifting harshly coming to stops. It's likely internal failure of clutchpacks/bearings which causes contaminants of metal and clutch material to be dispersed throughout trans. including the very precision valve bodies. Valves begin to stick, etc. And you now have problems. Have it diagnosed at Honda dealer, or reputable trans shop.

Hi Adstew,
the front diff has a sensor telling the control unit it when it is engaged (or not). It probably is, and it won't disengage. or the sensor is stuck. The selector lever tells the control unit you want 2WD but the sensor thinks the front axle is engaged. So it flashes.
When shifting to 2WD, normally the front axle will come free after a load change or a bit of turning the steering from side to side, but it sometimes happens that it gets stuck. You can find out:
lift the car free off ground, then select drive forward in 2WD. If the front wheels do not turn, then the sensor may be faulty or stuck. if the front wheels turn in 2WD mode, the diff is stuck and the sensor tells you so. Same or similar problem can happen with the center diff, by the way, on pajero/montero, etc.
regards
Winfried, the perfessa